We have had the Netgear unit in service since 12/1/07. 100% uptime except for a brief power outage (I have yet to order the USB power backup but it is on my list).
Probably the most difficult feature to setup was the user level permissions for the shares. I wanted to prevent our office staff from deleting or renaming the Amazing Chart db and imported files while retaining their ability to read/write the files. We used the CIFS permission editor within the web interface of the product to accomplish this.
The actual protection of the unit itself comes with the type of operating system it has. It basically has a hardened Linux operating system, meaning it has removed all unnecessary services and ways to get into the unit. This prevents unauthorized access (unless of course you leave the permissions wide open). For virus checking of the files themselves, it is just like any other hard drive or USB drive attached to you machine and leverages the security software (for example, Mcafee or Norton) from your existing client.
